linux-kernel - [PATCHv2, RFC 30/30] thp: map file-backed huge pages on fault

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Date:	Thu, 14 Mar 2013 19:50:35 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2, RFC 30/30] thp: map file-backed huge pages on fault

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

Look like all pieces are in place, we can map file-backed huge-pages
now.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/huge_mm.h |    4 +++-
 mm/memory.c             |    1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index c6e3aef..c175c78 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -80,7 +80,9 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
 	   (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&			\
 	   ((__vma)->vm_flags & VM_HUGEPAGE))) &&			\
 	 !((__vma)->vm_flags & VM_NOHUGEPAGE) &&			\
-	 !is_vma_temporary_stack(__vma))
+	 !is_vma_temporary_stack(__vma) &&				\
+	 (!(__vma)->vm_ops ||						\
+		  mapping_can_have_hugepages((__vma)->vm_file->f_mapping)))
 #define transparent_hugepage_defrag(__vma)				\
 	((transparent_hugepage_flags &					\
 	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||			\
diff --git a/mm/memory.c b/mm/memory.c
index 52bd6cf..f3b5a11 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3738,6 +3738,7 @@ retry:
 		if (!vma->vm_ops)
 			return do_huge_pmd_anonymous_page(mm, vma, address,
 							  pmd, flags);
+		return do_huge_linear_fault(mm, vma, address, pmd, flags);
 	} else {
 		pmd_t orig_pmd = *pmd;
 		int ret;
-- 
1.7.10.4

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